.hp{--hp-gutter:clamp(20px, 5vw, 72px);--hp-section:clamp(88px, 11vw, 168px);--hp-stage-tint:color-mix(in srgb, var(--clay-primary-soft) 72%, var(--clay-canvas));overflow-x:clip}.hp-wrap{width:100%;max-width:calc(1240px + 2 * var(--hp-gutter));padding-inline:var(--hp-gutter);margin-inline:auto}.hp h1,.hp h2{color:var(--clay-ink);text-wrap:balance;overflow-wrap:break-word;hyphens:auto}.hp :is(h1,h2):lang(ja){word-break:auto-phrase}.hp :is(h1,h2):lang(zh){word-break:keep-all;overflow-wrap:anywhere}.hp h2{letter-spacing:-.028em;font-size:clamp(34px,4.3vw,62px);line-height:1.06}.hp-lede{color:var(--clay-ink2);text-wrap:pretty;font-size:clamp(17px,1.45vw,20px);line-height:1.55}.hp-kicker{color:var(--clay-blue-text,var(--clay-palette-blue-text));font-family:var(--clay-font-display);font-size:15px;font-weight:800}.hp-head{gap:16px;max-width:640px;display:grid}.hp-head-center{text-align:center;justify-items:center;max-width:760px;margin-inline:auto}.hp-section{padding-block:var(--hp-section)}.hp-split{grid-template-columns:minmax(0,1fr) minmax(0,1fr);align-items:center;gap:clamp(40px,6vw,96px);display:grid}.hp[data-learn=ja] [data-sample=en],.hp[data-learn=en] [data-sample=ja],.hp-only-dark{display:none}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .hp-only-dark{display:block}:root:not([data-theme=light]) .hp-only-light{display:none}}:root[data-theme=dark] .hp-only-dark{display:block}:root[data-theme=dark] .hp-only-light{display:none}.hp-top{z-index:20;background:color-mix(in srgb, var(--clay-canvas) 86%, transparent);backdrop-filter:blur(14px);box-shadow:0 1px 0 var(--clay-line);position:sticky;top:0}.hp-top-row{align-items:center;gap:12px;min-height:68px;display:flex}.hp-logo{font-family:var(--clay-font-display);letter-spacing:-.01em;flex:none;align-items:center;gap:10px;font-size:20px;font-weight:900;display:inline-flex}.hp-top-links{color:var(--clay-ink2);gap:22px;margin-inline-start:22px;font-size:14px;font-weight:600;display:none}.hp-top-links a:hover{color:var(--clay-primary-deep)}.hp-top .learn-switch{margin-inline-start:auto}.hp-hero{grid-template-columns:minmax(0,1.42fr) minmax(0,1fr);align-items:center;gap:clamp(32px,4vw,64px);min-height:min(100svh - 68px,940px);padding-block:clamp(16px,2.5vw,32px);display:grid}.hp h1{letter-spacing:-.036em;font-size:clamp(44px,5.3vw,84px);line-height:1.04}.hp h1 em{color:var(--clay-primary);white-space:nowrap;font-style:normal}.hp-hero-copy{z-index:1;position:relative}.hp-hero-copy .hp-lede{max-width:34em;margin-top:clamp(20px,2.2vw,32px)}.hp-actions{flex-wrap:wrap;gap:14px;margin-top:clamp(28px,3vw,40px);display:flex}.hp-cta.clay-button{min-height:56px;padding-inline:30px;font-size:17px}.hp-note{color:var(--clay-ink3);margin-top:18px;font-size:14px}.hp-hero-media{justify-items:center;gap:14px;margin:0;display:grid;position:relative}.hp-hero-media:before{content:"";aspect-ratio:1;background:var(--hp-stage-tint);border-radius:50%;width:min(136%,600px);position:absolute;top:50%;left:50%;transform:translate(-50%,-52%)}.hp-hero-media figcaption{color:var(--clay-ink3);font-size:13px;position:relative}.hp-phone{aspect-ratio:1206/2622;background:var(--clay-card);box-shadow:0 0 0 1px var(--clay-line), 0 36px 70px -32px #0f172057, 0 14px 26px -18px #0f172033;border-radius:15%/7%;padding:2.4%;position:relative}.hp-phone>img,.hp-phone>video{object-fit:cover;background:var(--clay-canvas);border-radius:13%/6%;width:100%;height:100%}.hp-hero-phone{width:min(100%,350px,46svh - 69px);min-width:240px}.hp-band{background:var(--clay-card)}.hp-library-top{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:32px 64px;display:flex}.hp-stats{gap:clamp(28px,4vw,56px);margin:0;display:flex}.hp-stats div{flex-direction:column-reverse;display:flex}.hp-stats dd{font-family:var(--clay-font-display);letter-spacing:-.02em;margin:0;font-size:clamp(36px,4vw,56px);font-weight:900;line-height:1.05}.hp-stats dt{color:var(--clay-ink3);font-size:15px;font-weight:600}.hp-stairs{align-items:flex-end;gap:clamp(4px,.8vw,10px);margin-top:clamp(40px,5vw,72px);display:flex}.hp-stair{text-align:center;flex:1 1 0;gap:8px;min-width:0;display:grid}.hp-stair-count{color:var(--clay-ink3);font-variant-numeric:tabular-nums;font-size:clamp(11px,1.2vw,14px);font-weight:700}.hp-stair-block{height:calc(clamp(42px, 5vw, 64px) + var(--step) * clamp(10px, 1.7vw, 24px));border-radius:var(--clay-radius-md);background:var(--stair-bg);box-shadow:0 4px 0 color-mix(in srgb, var(--stair-ink) 22%, transparent);color:var(--stair-ink);font-family:var(--clay-font-display);place-items:center;font-size:clamp(15px,2vw,26px);font-weight:900;transition:transform .12s,background-color .12s,color .12s;display:grid}.hp-stair-block[data-step="1"]{--stair-bg:var(--clay-difficulty-level1-background);--stair-ink:var(--clay-difficulty-level1-text)}.hp-stair-block[data-step="2"]{--stair-bg:var(--clay-difficulty-level2-background);--stair-ink:var(--clay-difficulty-level2-text)}.hp-stair-block[data-step="3"]{--stair-bg:var(--clay-difficulty-level3-background);--stair-ink:var(--clay-difficulty-level3-text)}.hp-stair-block[data-step="4"]{--stair-bg:var(--clay-difficulty-level4-background);--stair-ink:var(--clay-difficulty-level4-text)}.hp-stair-block[data-step="5"],.hp-stair-block[data-step="6"]{--stair-bg:var(--clay-difficulty-level5-background);--stair-ink:var(--clay-difficulty-level5-text)}@media (hover:hover){.hp-stair:hover .hp-stair-block{transform:translateY(-4px)}}.hp-stair[aria-current=true] .hp-stair-block{background:var(--stair-ink);box-shadow:0 4px 0 color-mix(in srgb, var(--stair-ink) 60%, black);color:var(--clay-card)}.hp-stair[aria-current=true] .hp-stair-count{color:var(--clay-ink)}.hp-library-bar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px 32px;margin-top:32px;display:flex}.hp-topics a{text-decoration:none}.hp-library-all{color:var(--clay-primary-deep);font-family:var(--clay-font-display);white-space:nowrap;align-items:center;gap:8px;font-size:16px;font-weight:900;display:inline-flex}.hp-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,2.6vw,36px) clamp(14px,2vw,28px);margin-top:32px;display:grid}.hp-tile{align-content:start;gap:10px;min-width:0;display:grid}.hp-tile-thumb{aspect-ratio:16/9;border-radius:var(--clay-radius-md);background:var(--clay-line);display:block;position:relative;overflow:hidden}.hp-tile-thumb img{object-fit:cover;width:100%;height:100%;transition:transform .22s}@media (hover:hover){.hp-tile:hover .hp-tile-thumb img{transform:scale(1.03)}}.hp-tile-time{color:#fff;font-variant-numeric:tabular-nums;background:#000000ad;border-radius:7px;padding:1px 7px;font-size:12px;font-weight:700;position:absolute;bottom:8px;right:8px}.hp-tile-title{font-family:var(--clay-font-display);-webkit-line-clamp:2;-webkit-box-orient:vertical;font-size:clamp(14px,1.2vw,17px);font-weight:800;line-height:1.32;display:-webkit-box;overflow:hidden}.hp-tile-meta{min-width:0;color:var(--clay-ink3);align-items:center;gap:8px;font-size:13px;display:flex}.hp-tile-meta span:last-child{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.hp-known{border-radius:var(--clay-radius-xxl);box-shadow:0 var(--clay-shelf-card-light) 0 var(--clay-line);padding:clamp(18px,2.4vw,32px)}.hp-known-control{color:var(--clay-ink2);font-family:var(--clay-font-display);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px 16px;font-size:15px;font-weight:800;display:flex}.hp-known-list{margin:18px 0 0;padding:0;list-style:none;display:grid}.hp-known-list li+li{border-top:var(--clay-border-width-control) solid var(--clay-hairline,var(--clay-line))}.hp-known-list a{grid-template-columns:clamp(72px,8vw,108px) minmax(0,1fr) 76px;align-items:center;gap:clamp(12px,1.4vw,18px);padding-block:14px;display:grid}.hp-known-thumb{aspect-ratio:16/9;background:var(--clay-line);border-radius:10px;display:block;overflow:hidden}.hp-known-thumb img{object-fit:cover;width:100%;height:100%}.hp-known-body{gap:8px;min-width:0;display:grid}.hp-known-title{font-family:var(--clay-font-display);text-overflow:ellipsis;white-space:nowrap;font-size:15px;font-weight:800;overflow:hidden}.hp-known-meta{flex-wrap:wrap;align-items:center;gap:4px 6px;min-width:0;display:flex}.hp-known-meta .clay-coverage{flex:0 auto;min-width:0}.hp-known-bar{background:var(--clay-track-off,var(--clay-line));border-radius:999px;height:8px;display:block;overflow:hidden}.hp-known-bar i{border-radius:inherit;background:var(--clay-primary);height:100%;transition:width .42s cubic-bezier(.22,1,.36,1);display:block}.hp-known-number{font-family:var(--clay-font-display);font-variant-numeric:tabular-nums;letter-spacing:-.02em;text-align:end;font-size:clamp(30px,3vw,40px);font-weight:900}.hp-known-number small{color:var(--clay-ink3);margin-inline-start:1px;font-size:.5em;font-weight:800}.hp-cinema{background:var(--clay-palette-night-drop);color:var(--clay-palette-night-ink)}.hp-cinema h2{color:var(--clay-palette-night-ink)}.hp-cinema .hp-kicker{color:var(--clay-palette-night-blue-text)}.hp-cinema .hp-lede{color:var(--clay-palette-night-ink2)}.hp-sync{grid-template-columns:minmax(0,5fr) minmax(0,7fr);align-items:center;gap:clamp(28px,5vw,72px);margin-top:clamp(40px,5vw,72px);display:grid}.hp-sync-video{aspect-ratio:16/9;border-radius:var(--clay-radius-xl);background:var(--clay-palette-player-letterbox);position:relative;overflow:hidden}.hp-sync-video>img{object-fit:cover;width:100%;height:100%}.hp-sync-host,.hp-sync-host iframe{border:0;width:100%;height:100%;position:absolute;inset:0}.hp-sync-host:empty{display:none}.hp-sync-play{border-radius:var(--clay-radius-lg);background:var(--clay-primary);width:76px;height:64px;box-shadow:0 5px 0 var(--clay-primary-deep);color:var(--clay-on-primary);cursor:pointer;border:0;place-items:center;display:grid;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.hp-sync-video[data-sound=loading] .hp-sync-play{opacity:.6}.hp-sync-text{gap:24px;min-width:0;display:grid}.hp-sync-sentences{--subtitle-size:clamp(25px, 3vw, 42px);font-size:var(--subtitle-size);color:var(--clay-palette-night-ink);margin:0;display:grid}.hp-cinema .hp-sync-sentences .s{visibility:hidden;background:0 0;grid-area:1/1;align-self:center;margin:0;padding:0;line-height:1.85}.hp-cinema .hp-sync-sentences .s.is-active{visibility:visible}.hp-cinema .hp-sync-sentences .w[data-l]{box-shadow:none;color:var(--clay-palette-night-ink);cursor:default;pointer-events:none;background:0 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100%);background:var(--clay-palette-night-ink);width:2px;position:absolute}.hp-sync-toggle{border-color:var(--clay-palette-night-raised);background:var(--clay-palette-night-card);color:var(--clay-palette-night-ink);cursor:pointer;justify-self:start}.hp-quality-top{grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);align-items:end;gap:32px clamp(40px,6vw,96px);display:grid}.hp-points{color:var(--clay-ink2);gap:14px;margin:0;padding:0;font-size:16px;line-height:1.5;list-style:none;display:grid}.hp-points li{grid-template-columns:22px minmax(0,1fr);gap:10px;display:grid}.hp-points svg{color:var(--clay-state-mastered-text);margin-top:2px}.hp-compare{grid-template-columns:minmax(0,5fr) minmax(0,7fr);align-items:stretch;gap:clamp(16px,2vw,24px);margin-top:clamp(40px,5vw,64px);display:grid}.hp-compare figure{border-radius:var(--clay-radius-xxl);margin:0;padding:clamp(22px,3vw,40px)}.hp-compare figcaption{font-family:var(--clay-font-display);margin-bottom:18px;font-size:14px;font-weight:800}.hp-raw{background:color-mix(in srgb, var(--clay-line) 42%, var(--clay-canvas));flex-direction:column;display:flex}.hp-raw p{margin-block:auto}.hp-raw figcaption{color:var(--clay-ink3)}.hp-raw p{color:var(--clay-ink3);font-size:clamp(19px,2.15vw,28px);line-height:1.6}.hp-ours{box-shadow:0 var(--clay-shelf-card-light) 0 var(--clay-line);align-content:start;gap:4px;display:grid}.hp-ours figcaption{color:var(--clay-primary-deep);margin-bottom:14px}.hp-ours-lines{gap:18px;display:grid}.hp .hp-plain{margin:0;font-size:clamp(20px,2.15vw,28px);line-height:1.85}.hp .hp-plain .w{box-shadow:none;color:inherit;cursor:default;pointer-events:none;background:0 0}.hp-translation{color:var(--clay-ink2);font-size:clamp(15px,1.3vw,17px)}.hp-translation-picker{flex-wrap:wrap;gap:4px;margin-top:22px;display:flex}.hp-translation-picker button{color:var(--clay-ink3);cursor:pointer;background:0 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12px;display:flex}.hp-phrase-meaning b{color:var(--clay-ink);font-family:var(--clay-font-display);font-size:17px;font-weight:900}.hp-states-stage{border-radius:var(--clay-radius-xxl);max-width:1040px;box-shadow:0 var(--clay-shelf-card-light) 0 var(--clay-line);margin:clamp(40px,5vw,72px) auto 0;padding:clamp(20px,3.4vw,48px)}.hp-states-top{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}.hp-states-known{color:var(--clay-ink3);align-items:center;gap:12px;font-size:14px;line-height:1.3;display:flex}.hp-states-known span{max-width:11em}.hp-states-known b{color:var(--clay-ink);font-family:var(--clay-font-display);font-variant-numeric:tabular-nums;letter-spacing:-.02em;font-size:clamp(36px,3.6vw,52px);font-weight:900;line-height:1}.hp-states-known small{color:var(--clay-ink3);font-size:.5em}.hp-states-top .clay-segmented button{white-space:nowrap}.hp-states-bar{border-radius:999px;gap:3px;height:10px;margin-top:18px;display:flex;overflow:hidden}.hp-states-bar i{background:var(--clay-state-unseen-dot);flex:0 1 0;min-width:0;transition:flex-grow .5s cubic-bezier(.22,1,.36,1)}.hp-states-bar i[data-state=queried]{background:var(--clay-state-queried-dot)}.hp-states-bar i[data-state=learning]{background:var(--clay-state-learning-dot)}.hp-states-bar i[data-state=mastered]{background:var(--clay-state-mastered-dot)}.hp-states-lines{margin-top:clamp(20px,2.4vw,32px)}.hp .hp-lines{--subtitle-size:clamp(19px, 2vw, 26px);font-size:var(--subtitle-size);margin:0}.hp .hp-lines .s{background:0 0;border-radius:0;margin:0;padding:4px 0;line-height:2.05}.hp .hp-lines .w.is-picked{outline:2px solid var(--clay-primary);outline-offset:1px}.hp-word{border-radius:var(--clay-radius-lg);background:var(--clay-canvas);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 24px;min-height:88px;margin-top:clamp(16px,2vw,24px);padding:16px 20px;display:flex}.hp-word-hint{width:100%;color:var(--clay-ink3);text-align:center;font-size:15px}.hp-word-main{flex:260px;grid-template-columns:auto minmax(0,1fr);align-items:baseline;gap:2px 10px;min-width:0;display:grid}.hp-word-main b{font-family:var(--clay-font-display);font-size:22px;font-weight:900}.hp-word-main span{color:var(--clay-ink3);font-size:14px}.hp-word-main p{color:var(--clay-ink2);grid-column:1/-1;font-size:15px}.hp-legend{grid-template-columns:repeat(4,minmax(0,1fr));gap:20px 24px;max-width:1040px;margin:32px auto 0;padding:0;list-style:none;display:grid}.hp-legend li{grid-template-columns:10px minmax(0,1fr);align-items:baseline;gap:2px 10px;display:grid}.hp-legend b{font-family:var(--clay-font-display);font-size:15px;font-weight:900}.hp-legend b span{color:var(--clay-ink3);font-weight:700}.hp-legend p{color:var(--clay-ink3);grid-column:2;font-size:14px;line-height:1.4}.hp-legend 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